Large-area arrays of highly oriented Co-doped ZnO nanorods with pyramidal hexagonal structure are grown on silica substrates by wet chemical decomposition of zinc-amino complex in an aqueous medium. In case of undoped ZnO with an equi-molar ratio of Zn 2+/hexamethylenetetramine (HMT), highly crystalline nanorods were obtained, whereas for Co-doped ZnO, good quality nanorods were formed at a higher Zn 2+/HMT molar ratio of 4:1. Scanning electron microscope (SEM) studies show the growth of hexagonal-shaped nanorods in a direction nearly perpendicular to the substrate surface with a tip size of ∼50 nm and aspect ratio around 10. The XRD studies show the formation of hexagonal phase pure ZnO with c-axis preferred orientation. The doping of Co ions in ZnO nanorods was confirmed by observation of absorption bands at 658, 617 and 566 nm in the UV-vis spectra of the samples. The optical studies also suggest Co ions to be present both in +2 and +3 oxidation states. From the photoluminescence studies, a defect-related emission is observed in an undoped sample of ZnO at 567 nm. This emission is significantly quenched in Co-doped ZnO samples. Further, the Co-doped nanorods have been found to show ferromagnetic behavior at room temperature from vibrating sample magnetometer (VSM) studies. © 2009 Elsevier Ltd. All rights reserved.
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M. Ka Patra, Manzoor, Kb, Manoth, Ma, Vadera, S. Ra, and Kumar, Na, “Studies on structural and magnetic properties of Co-doped pyramidal ZnO nanorods synthesized by solution growth technique”, Journal of Physics and Chemistry of Solids, vol. 70, pp. 659-664, 2009.